<span>B. We were walking by the lake when we heard a siren.
C. By the time I graduated, I had attended three different high schools.
D. Though he had been rude at first, Rupert eventually won over the congregation
These three sentences are all correct, because even if the verb tense shifts it still makes sense within the context of the situation.</span>
The grammatical mistakes found in the text consist of the incorrect use of the articles "a" and "an", which means we need to correct them by changing the articles.
<h3>The use of "an" and "an"</h3>
The indefinite articles "a" and "an" are used before singular nouns. The article "a" must be used before nouns that begin with a consonant sound, whereas "an" must come before those that begin with a vowel sound.
The grammatical mistakes in the text consist of using one article when the other should be employed. Let's correct them below:
... an treasure hunt --> a treasure hunt
... an handheld GPS --> a handheld GPS
... a adventure-loving nature --> an adventure-loving nature
Learn more about indefinite articles here:
brainly.com/question/19174890
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Answer: At that date, 293,000 slaves lived in Virginia alone, making up 42 percent of all slaves in the U.S. at the time. South Carolina, North Carolina, and Maryland each had over 100,000 slaves.
Explanation:
